{
  "manageEntity": {
    "action": "Save",
    "entityId": "439709110",
    "entityType": "Track",
    "nonce": "0x6c42a7ec2ec2954ce42a78f719186508cd6268bf92f69ae5d4c56717a84da9ac",
    "signature": "0x054b9ab97d69cd9d24b0568a66e947e40be29b5c67077d620603254e8a224e0967b2181ec6704f83b2b8e3ba7a1e814479f60f51c9ace231b22c03791fb0d2721b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}